Bosch 3931 Operating/Safety Instructions Manual page 7

BM 2610919254 12/02 12/18/02
FILTER
COMPARTMENT
LOCK
FIG. 4
INSTALLING THE DUST BAG
When dry-vacuuming such materials as dust
from drywall, plaster, cement, soot, and
flour, a dust bag should be inserted.
Even when vacuuming other dry materials,
using a dust bag extends the amount of time
the unit operates at high performance and
extends the amount of time it takes for the
filter cartridge to become clogged. It also
makes the disposal of dust easier.
Notes:
• Bags should not be used when wet-
vacuuming.
• The filter cartridges must be installed,
even when using a bag.
To install the bag:
1. Unlock the canister latches and remove
the control unit.
2. Grasp a new dust bag at the flange. Push
it over the bottom of the connection piece
first and then over the catch on the top of
the connection piece. Make sure that the
full length of the dust bag faces against
the inner wall of the canister.
3. Re-attach the control unit.
4. Lock the canister latches.
REMOVING THE DUST BAG
1. Unlock the canister latches and remove
the control unit.
2. Pull the dust bag away from and off of the
connection piece.
3. Close the opening in the dust bag by
folding down the lid
4. Remove bag and dispose of properly.
10:52 AM Page 7
FILTER
CARTRIDGE
REMOVING THE FILTER CARTRIDGES
1. First, clean the filters by setting the mode
selector switch to the PULSE-CLEAN™
mode, which takes only 10 seconds.
2. To open the filter access compartment,
use a coin to rotate the filter compartment
lock by 1/4 turn in the direction of the
arrow and push the lock in.
3. Lift up the top section of the control unit.
4. Grasp the filter cartridge by the fins, pull
up and remove.
Replace a damaged filter cartridge
immediately.
THOROUGH CLEANING OF THE
If necessary, the filter cartridges can also be
cleaned with a soft brush and can also be
washed with water.
REPLACING THE FILTER CARTRIDGES
1. Insert new or cleaned filter cartridge and
ensure firm seating.
2. Lower the top section down again.
3. With slight pressure from the top of the
control unit, the filter compartment lock
will snap back again.
The motor protection filters are basically
maintenance-free. Take out the motor
protection filters from time to time and wash
them. Allow them to dry thoroughly before
reinserting.
-7-
CONTROL UNIT
TOP SECTION
CONTROL UNIT
BOTTOM SECTION
MOTOR PROTECTION
FILTER
FILTER CARTRIDGES
CLEANING THE MOTOR
PROTECTION FILTERS